Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
tu cach » tu cac
va hanh » van hanh, va thanh, va danh
xa hanh » xa thanh, xa khanh, da hanh
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
so sach » so sanh, bo sach, co sach
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (so sach)) ky nang x hoi. hieu ve pham thuc ((xa hanh) OR (va hanh)) dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (so sach)) ky nang x hoi. hieu ve pham thuc ((xa hanh) OR (va hanh)) dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (so sach)) ky nang x hoi. hieu ve pham thuc ((xa hanh) OR (va hanh)) dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (so sach)) ky nang x hoi. hieu ve pham thuc ((xa hanh) OR (va hanh)) dai cua te*.